1 /*
2 * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26 /*
27 * @(#)SingleByteEncoder.java 1.14 03/01/23
28 */
29
30 package com.sun.codemodel.internal.util;
31
32 import java.nio.ByteBuffer;
33 import java.nio.CharBuffer;
34 import java.nio.charset.Charset;
35 import java.nio.charset.CharsetEncoder;
36 import java.nio.charset.CoderResult;
37
38 import sun.nio.cs.Surrogate;
39
40
41 abstract class SingleByteEncoder
42 extends CharsetEncoder
43 {
44
45 private final short index1[];
46 private final String index2;
47 private final int mask1;
48 private final int mask2;
49 private final int shift;
50
51 private final Surrogate.Parser sgp = new Surrogate.Parser();
52
53 protected SingleByteEncoder(Charset cs,
54 short[] index1, String index2,
55 int mask1, int mask2, int shift)
56 {
57 super(cs, 1.0f, 1.0f);
58 this.index1 = index1;
59 this.index2 = index2;
60 this.mask1 = mask1;
61 this.mask2 = mask2;
62 this.shift = shift;
63 }
64
65 public boolean canEncode(char c) {
66 char testEncode;
67 testEncode = index2.charAt(index1[(c & mask1) >> shift]
68 + (c & mask2));
69 if (testEncode == '\u0000')
70 return false;
71 else
72 return true;
73 }
74
75 private CoderResult encodeArrayLoop(CharBuffer src, ByteBuffer dst) {
76 char[] sa = src.array();
77 int sp = src.arrayOffset() + src.position();
78 int sl = src.arrayOffset() + src.limit();
79 sp = (sp <= sl ? sp : sl);
80 byte[] da = dst.array();
81 int dp = dst.arrayOffset() + dst.position();
82 int dl = dst.arrayOffset() + dst.limit();
83 dp = (dp <= dl ? dp : dl);
84
85 try {
86 while (sp < sl) {
87 char c = sa[sp];
88 if (Surrogate.is(c)) {
89 if (sgp.parse(c, sa, sp, sl) < 0)
90 return sgp.error();
91 return sgp.unmappableResult();
92 }
93 if (c >= '\uFFFE')
94 return CoderResult.unmappableForLength(1);
95 if (dl - dp < 1)
96 return CoderResult.OVERFLOW;
97
98 char e = index2.charAt(index1[(c & mask1) >> shift]
99 + (c & mask2));
100
101 // If output byte is zero because input char is zero
102 // then character is mappable, o.w. fail
103 if (e == '\u0000' && c != '\u0000')
104 return CoderResult.unmappableForLength(1);
105
106 sp++;
107 da[dp++] = (byte)e;
108 }
109 return CoderResult.UNDERFLOW;
110 } finally {
111 src.position(sp - src.arrayOffset());
112 dst.position(dp - dst.arrayOffset());
113 }
114 }
115
116 private CoderResult encodeBufferLoop(CharBuffer src, ByteBuffer dst) {
117 int mark = src.position();
118 try {
119 while (src.hasRemaining()) {
120 char c = src.get();
121 if (Surrogate.is(c)) {
122 if (sgp.parse(c, src) < 0)
123 return sgp.error();
124 return sgp.unmappableResult();
125 }
126 if (c >= '\uFFFE')
127 return CoderResult.unmappableForLength(1);
128 if (!dst.hasRemaining())
129 return CoderResult.OVERFLOW;
130
131 char e = index2.charAt(index1[(c & mask1) >> shift]
132 + (c & mask2));
133
134 // If output byte is zero because input char is zero
135 // then character is mappable, o.w. fail
136 if (e == '\u0000' && c != '\u0000')
137 return CoderResult.unmappableForLength(1);
138
139 mark++;
140 dst.put((byte)e);
141 }
142 return CoderResult.UNDERFLOW;
143 } finally {
144 src.position(mark);
145 }
146 }
147
148 protected CoderResult encodeLoop(CharBuffer src, ByteBuffer dst) {
149 if (true && src.hasArray() && dst.hasArray())
150 return encodeArrayLoop(src, dst);
151 else
152 return encodeBufferLoop(src, dst);
153 }
154
155 public byte encode(char inputChar) {
156 return (byte)index2.charAt(index1[(inputChar & mask1) >> shift] +
157 (inputChar & mask2));
158 }
159 }